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CHAPTER 8 FIXING SYSTEM
8-12
COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
III . CONTROLLING THE FIXING TEMPERATURE
A. Outline
The fixing temperature mechanism is controlled for the following:
[1] Down sequence
[2] Temperature by Mode
[3] Error detection
Figure 8-301 Construction of the Control System
DC controller PCB
J508B
1
7
8
10
20
S-TEMP
0V
0V
M-TEMP
When '1', the main heater turns on.
Upper fixing roller
Main
heater
Sub thermistor
Main thermistor
Thermal switch
9
J505A
111
11
10
0V
24V
MHDTC
SHDTC
SH-ON
MH-ON
9
14
RLY
Relay
Front door
SSR
When the sub heater is powered, '0'.
12
13
Sub heater
When 223˚C, the AC
line is turned off.
Voltage to suit the
temperature detected by the
main thermistor.
Voltage suited to the temperature
detected by the sub thermistor